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发明名称
BLACKBOARD ERASER OF RALLER TYPE
摘要
申请公布号
KR1019900007551(B1)
申请公布日期
1990.10.15
申请号
KR1019870012592
申请日期
1987.11.09
申请人
发明人
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主分类号
代理机构
代理人
主权项
地址
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